Grease pump



. I. BELLAR. GREASE PUMP. APPLICATION FILED SEPT. 6. I920. 1,432,658. Patented Oct. 17, 1922.

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Patented Oct. 17, 1922.

UNITED STATES PATENT OFFICE.

GEORGE GONB'IANTINI'BCO, O1" WEYBRIDGE, ENGLAND, ASSIGNQB. TO WALTER HADDON,

01' LONDON, ENGLAND.

ALTERNA'I'ING LIQUID CURRENT MOTOR.

Application filed August 26, 1921. Serial No. 495,221.

(GRANTED UNDER. THE PROVISIONS OF THE ACT 01' MARCH 8, 1921, 41 STAT. I, 1313.)

To all whom it may concern Be it known that I, (iaoaon CONSTANT!- NEsoo, a subject of the King of Great Britain and Ireland, residing at Carmen S lva, Beechwood Avenue, ()atlands Park, eybridge, in the county of Surrey, England, have invented certain new and useful Imrovements in Alternating Li uid Current otors for which I have file an a plication in reat Britain Oct. 3 1916, iiatent No. 110,003 of which the following is a specification.

The resent invention relates to motors 0 erated by alternating liquid currents of tli e kind described in the specification of Letters Patent Reissue No. 14738, and has for its object the construction of asynchronous rotary motors actuated by such currents. The term alternating li(uid current is defined in specification of atent No. 1334290.

It will be readily seen that if an eccentrio is situated on a shaft, and c linders and pistons are arranged around t e eccentric at angles of 120 degrees apart, and if these pistons are acted on by alternating liquid vibrations also diii'ering in phase by 120 degrees, the effect of the liquid vibrations acting on the pistons is to produce as it were a series 0 impulses exerted in order about the axis of the shaft acting on the eccentric in a direction parallel with the shaft and exerting a torque if the shaft is made to rotate initially at the synchronous speed.

Such motors have been described in Letters Patent Serial No. 1211679 and Letters Patent Reissue No. 14738. It will be seen, however, that such a motor will not start, and will not exert a torque, unless running at the synchronous speed.

The present invention consists in an asynchronous motor actuated by polyphase alternating liquid currents.

The invention further consists in a rotary motor comprising a stator, transmitter and rotor, the rotor being provided with means allowing it to sli relatively to the rotating impulses, such sip being effected against a resistance.

The invention further consists in a rotary motor comprising a stator, transmitter, rotor, reactance and collector, the collector consistin of a short-circuiting device carried by t e rotor itself, while the reactance is also carried by the rotor, and consists in a suitable elastic supporting device.

The invention also consists in a motor comprising a stator having three cylinders placed at 120 degrees apart, with pistons workm in such cylinders, and actuated by three p ases of an alternating three-phase wave transmission system, the transmitter comprising rings interposed between the stator pistons and the pistons of the rotor, such rotor pistons working in cylinders against the action of springs and a resistance, such as that of liquid pumped through small apertures.

The invention further consists in ad'ustably restricting the passages through w ich litlilid in the rotor is pumped.

he invention further consists in the improved constructions of asynchronous motor ierelnafter described.

It will be seen that very many different forms of motor can be constructed and that many different applications and combinations of the machine are ossible, as is the case in asynchronous in action polyphase electric motors. The motor is analo one to the electric motor of this type, and 1s analogous thereto in its many applications.

Referring to the accompanying diagrammatic drawings:

Figure 1 is a section of the motor constructed according to the invention;

Figure 2 is an axial section of a modified form of three-phase asynchronous motor;

Figure 3 is a section on the line 3-3, Figure 2;

Figure 4 is an end elevation of the motor shown in Fi re 2;

Figure 5 1s a section on the line 5-5, Fi ure 2.

, igure 6 is a section of the outer part of the stator on the line 6--6, Figure 2;

Figure 7 is an axial section of a sim le form of asynchronous motor suitable or low powers;

Figure 8 is an axial section of a modified form.

In the form of the invention shown in Figure 1, the stator comprises three oylinders, a, b, c, which are connected to the When starting a motor according to this modification, in order to obtain a large starting torque, the handle 20 must be turned so as toopen as far as necessary the assages 17 connecting the rotor cylinders. VEhen the motor has attained a normal s eed, the handle will be turned so as to partially close these passages until the slip is reduced to the minimum practicable.

It will be seen that the ball bearin s illustrated may be replaced by other antiriction bearing surfaces, and other devices may be used to avoid friction. Further, it is desirable that ood ventilation should be provided in ord iar to dissipate the heat generated in the rotor when working with considerable slip. The lubricating oil ma be circulated b a pump to effect cooling 0 the rotor if desired.

In the form of the invention shown in Figure 7, the cylinders and pistons in the rotor are dispensed with. In this form of the invention, the three phases are connected to the stator 22, actuating three pistons which communicate motion to the oscillating body 23, which is in frictional contact with the rotor 24 over the spherical surface between them, and is acted on by a spring 25, which tends to keep it normal to the axis of the motor. The rotor 24 is suitablykeyed to the shaft 26. In this case the reaetance is provided by the spring 25. In this case a eneral ball bearing 27 is also provided, to eep co-axial the parts 23 and 28.

The workin of the motor shown in Figure 7 is as folIowm-The rotating field pro.- duced by the pulsations of the three phase alternating current in the stator 22 causes the deflection of the plane of the front face of the part 28, which is thus inclined to its normal position at right angles to the axis of the motor, the line of maximum inclination in this plane rotating uniformly about the axis. This inclination is effected against the action of the spring 25, which thus produces the necessar reactance on the members 23, 28. The riction between the members 23 and 24 operates in a similar manner to the liquid friction in the modifications above described, with the result that a torque is produced, acting on the member 24, cansing the shaft 26 to rotate. The friction between the parts 23 and 24 should be sufiicient to prevent unduly large slip.

In the examples Igiven above, onlyi three phase motors have een described. twill be seen, however, that similar constructions can be adopted for any number of phases Further, the stator may be worked by an n-phuse line, and the rotor may be an mphased rotor. The friction device shown in Figure 7 corresponds to an infinite number of phases in the rotor and a limited number of phases in the stator. In order to get a continuous torque, however, three phases at least are necessary. If two bases only were cm loyed, the motor would revolve if initia ly turned in one direction or the other. The torque, however, would not be constant, but of a pulsating nature. With three or more phases, however, the torque is constant and in one direction. In order to reverse a motor constructed according to this invention, it is only necessary to interchange the phases in the stator by a suitable reversing switch.

In a modified form of motor shown in Figure 8 instead of using a spring as a reactance in order to limit the inclinationof the oscillatin member, the reactance may be provided Try friction between the transmitter 31 and the rotor 32. The limitation of the stroke of the stator pistons 33 is provided for by the flange 34 which bears against the rotor at one oint. The necessary friction arises from t e pressure of the pistons in the axial direction transmitted through the transmitter to the rotor 32. A thrust bearing may, if desired, be interposed between the pistons 33 and the flange 34 as in the modifications described above.

It will be seen that with motors as above described the maximum torque possible is the torque which is obtained at synchronous speed, that is, when the slip is zero, and it is not possible to obtain the igher torque on starting. The speed of motors according to this invention also cannot exceed synchnonous speed equal to that of the generator proiiucing the wave motion in the transmission It should be understood that the maximum tor ue on starting asynchronous motors accor ing to the invention is a function of the resistance and capacity of the rotor circuit. If the resistance is diminished below a certain limit, the starting tor ue diminished instead of increasing. Similarly, in a monophase motor constructed similarly to that above described but with two pistons instead of three, there is a certain critical relation between resistance and reactance at which with a very slight impulse the rotor will immediately be caused to rotate. This property can be made use of in adjusting the resistance in such a machine b means of a suitable plug, as above described, so as to obtain that value of resistance at which the motor will start easily with a very small impulse.

I claim:

1. An asynchronous rotary alternating liquid pressure motor comprising in combination, a stator; a transmitter; means for imparting impulses to said transmitter successively, producing a rotatin mechanical field; a rotor; and non-rigi connectin means allowing slip between said rotor an Ill sairl rotatlpg mechanicol field and means optong while said reactanoe G0mprises a nonposlng reslstance to sand slip as set forth. r1 lcl mechanical connection permittin slip. 1o

2. An asynchronous rotary alternating n testimony whereof I have signed my liquid pressure motor; comprlsing a stator, mime to this s ecifioatlon. 5 a, transmitter, a rotor havin r pistons, 11 re- GEOR 1E CDNWIANTINESUO,

ucmnce and a collector, sai collector com- Witnesses: rism? a chamber inside said rotor andpas- JAB. E. Armor, sages eading from said chamber to said pis- W. F. M. ADAMS.

Certificated Correction.

It is bomb certified that in Letters Patent No. 1,432,658, ranted October 17, 1922, upon 1; e a plication of Charles J. Bellar, of Clevelan Ohio, for an improvement in reuse Pumps an error appears in the printed specification requiring correction as follows: In the heading of the drawings and of the printed specification, date of filing application, for September 6, 1920 read August 6, 1.920; and that the said Letters Patents should be read with this correction therein that the some mav conform to the record of the case in the Patent Office.

Signed and aeaied this 22d day of January, A. D., 19%.

[m] KARL FENNING,

Acting Commissioner of Patents. 

